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From Wikipedia, the free encyclopedia
Loreto Formation (Spanish: Formación Loreto) is a sedimentary formation of Late Eocene age in the southernmost Magallanes Basin. It overlies the Leña Dura Formation and the contact with an overlying formation is not observed.[1] From 2013 to 2020 its coals were mined in Invierno mine, Riesco Island.[2][3][4]
Loreto Formation | |
---|---|
Stratigraphic range: Priabonian (Divisaderan) | |
Type | Geological formation |
Underlies | not observed |
Overlies | Leña Dura Formation |
Lithology | |
Primary | Sandstone |
Other | Conglomerate, coal |
Location | |
Coordinates | 53.1°S 71.1°W |
Approximate paleocoordinates | 55.3°S 61.4°W |
Region | Magallanes y la Antártica Chilena Region |
Country | ![]() |
Extent | Magallanes Basin |
Type section | |
Named by | Hoffstetter et al. |
Year defined | 1957 |
The formation contains fossil wood, leaf imprints and palynomorphs.[5] Also fossil fish of Striatolamia macrota and Ischyodus dolloi and indeterminate Spheniscidae fossils have been found in the formation.[6][7]
The formation crops out in Brunswick Peninsula and Sierra Baguales among other places.[8]
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